US9285099B2 - Parabolic troffer-style light fixture - Google Patents
Parabolic troffer-style light fixture Download PDFInfo
- Publication number
- US9285099B2 US9285099B2 US13/453,924 US201213453924A US9285099B2 US 9285099 B2 US9285099 B2 US 9285099B2 US 201213453924 A US201213453924 A US 201213453924A US 9285099 B2 US9285099 B2 US 9285099B2
- Authority
- US
- United States
- Prior art keywords
- light
- light fixture
- mount
- leds
- fixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
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- 230000014759 maintenance of location Effects 0.000 claims description 16
- 230000003287 optical Effects 0.000 claims description 11
- 239000000463 materials Substances 0.000 description 18
- 239000000203 mixtures Substances 0.000 description 14
- 238000002156 mixing Methods 0.000 description 7
- 239000007787 solids Substances 0.000 description 7
- 239000003086 colorants Substances 0.000 description 5
- 238000000034 methods Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004065 semiconductors Substances 0.000 description 3
- 280000762004 Cree, Inc. companies 0.000 description 2
- 281000012441 Cree, Inc. companies 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000004313 glare Effects 0.000 description 2
- 239000010410 layers Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound 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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound 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[Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N aluminum nitride Chemical compound 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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/0008—Reflectors for light sources providing for indirect lighting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
- F21V11/06—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using crossed laminae or strips, e.g. grid-shaped louvers; using lattices or honeycombs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
- F21V19/003—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
- F21V19/004—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources by deformation of parts or snap action mountings, e.g. using clips
-
- F21Y2101/02—
-
- F21Y2103/003—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
- F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Abstract
Description
1. Field of the Invention
The invention relates to troffer-style lighting fixtures, and more particularly, to indirect troffer-style lighting fixtures utilizing solid state light sources.
2. Description of the Related Art
Troffer-style fixtures are ubiquitous in commercial office and industrial spaces throughout the world. In many instances these troffers house elongated fluorescent light bulbs that span the length of the troffer. Troffers may be mounted to or suspended from ceilings, such as being suspended by a “T-grid”. Often the troffer may be recessed into the ceiling, with the back side of the troffer (i.e. troffer pan) protruding into the plenum area above the ceiling a distance of up to six inches or more. In other arrangements, elements of the troffer on the back side dissipate heat generated by the light source into the plenum where air can be circulated to facilitate the cooling mechanism. U.S. Pat. No. 5,823,663 to Bell, et al. and U.S. Pat. No. 6,210,025 to Schmidt, et al. are examples of typical troffer-style fixtures. These fixtures can require a significant amount of ceiling space to operate properly. Many of these fixtures utilize a grid of louvers to more evenly distribute the light and reduce glare.
More recently, with the advent of the efficient solid state lighting sources, these troffers have been used with solid state light sources, such as light emitting diodes (LEDs). LEDs are solid state devices that convert electric energy to light and generally comprise one or more active regions of semiconductor material interposed between oppositely doped semiconductor layers. When a bias is applied across the doped layers, holes and electrons are injected into the active region where they recombine to generate light. Light is produced in the active region and emitted from surfaces of the LED.
LEDs have certain characteristics that make them desirable for many lighting applications that were previously the realm of incandescent or fluorescent lights. Incandescent lights are very energy-inefficient light sources with approximately ninety percent of the electricity they consume being released as heat rather than light. Fluorescent light bulbs are more energy efficient than incandescent light bulbs by a factor of about 10, but are still relatively inefficient. LEDs by contrast, can emit the same luminous flux as incandescent and fluorescent lights using a fraction of the energy.
In addition, LEDs can have a significantly longer operational lifetime. Incandescent light bulbs have relatively short lifetimes, with some having a lifetime in the range of about 750-1000 hours. Fluorescent bulbs can also have lifetimes longer than incandescent bulbs such as in the range of approximately 10,000-20,000 hours, but provide less desirable color emission. In comparison, LEDs can have lifetimes between 50,000 and 70,000 hours. The increased efficiency and extended lifetime of LEDs is attractive to many lighting suppliers and has resulted in LED light sources being used in place of conventional lighting in many different applications. It is predicted that further improvements will result in their general acceptance in more and more lighting applications. An increase in the adoption of LEDs in place of incandescent or fluorescent lighting would result in increased lighting efficiency and significant energy saving.
LED components or lamps have been developed that comprise an array of multiple LED packages mounted to a (PCB), substrate or submount. The array of LED packages can comprise groups of LED packages emitting different colors, and specular reflector systems to reflect light emitted by the LED chips. Some of these LED components are arranged to produce a white light combination of the light emitted by the different LED chips.
In order to generate a desired output color, it is sometimes necessary to mix colors of light which are more easily produced using common semiconductor systems. Because of the physical arrangement of the various source elements, multicolor sources often cast shadows with color separation and provide an output with poor color uniformity. Thus, one challenge associated with multicolor light sources is good spatial color mixing over the entire range of viewing angles. One known approach to the problem of color mixing is to use a diffuser to scatter light from the various sources.
Many current luminaire designs utilize forward-facing LED components with a specular reflector disposed behind the LEDs. One design challenge associated with multi-source luminaires is blending the light from LED sources within the luminaire so that the individual sources are not visible to an observer. Heavily diffusive elements are also used to mix the color spectra from the various sources to achieve a uniform output color profile. To blend the sources and aid in color mixing, heavily diffusive exit windows have been used. However, transmission through such heavily diffusive materials causes significant optical loss.
Some recent designs have incorporated light sources or light engines utilizing an indirect lighting scheme in which the LEDs or other sources are aimed in a direction other than the intended emission direction. This may be done to encourage the light to interact with internal elements, such as diffusers, for example. One example of an indirect fixture can be found in U.S. Pat. No. 7,722,220 to van de Ven which is commonly assigned with the present application.
There have also been recent designs that focus more on retrofitting or redesigning existing troffer-style light fixtures in order to utilize LEDs as a light source. This allows manufacturers to use existing manufacturing capabilities to produce troffer housings for LEDs, which is thought to help in reducing overall troffer costs. In some of these fixtures, hundreds of LED packages are mounted to the surface of an existing troffer pan to essentially cover the troffer pan surface with emitters, sometimes utilizing up to 400 LED packages. The emitters are then driven with a relatively low electrical signal so that the fixture gives a relatively uniform output with no visible hot spots.
Troffer-style light fixtures are typically provided with a prismatic lens or diffuser over the troffer pan/housing opening that faces the room to be illuminated. The prismatic diffuser is included to disperse some of the light from the source. Despite the use of hundreds of LED packages in an effort to spread the light evenly, these LED fixtures can still exhibit multiple emission hot spots as the light passes through the prismatic diffuser, producing an undesirable output. These fixtures having hundreds of LED packages can be relatively expensive, with the bulk of the expense being the LED packages, along with the cost and complexity of mounting, interconnecting, and driving the LED packages.
Embodiments of a light fixture comprise the following elements. A fixture housing defines an open end. A back surface is in the housing opposite the open end. At least one functional louver is between the back surface and the open end, the functional louver comprising side reflective surfaces and a mount surface facing toward the back surface. At least one light source is on the mount surface.
Embodiments of a light fixture comprise the following elements. A fixture housing defines an open end. A back surface is in the housing opposite the open end. At least one functional louver and at least one optical louver are arranged in a grid between the back surface and the open end. A plurality of light emitting LEDs is arranged on the functional louvers and faces the back surface.
Embodiments of a louver for light fixtures comprise the following elements. First and second reflective side surfaces are angled to meet at a vertex. A mount surface extends between the two ends of the side reflective surfaces opposite the vertex, the mount surface comprising notches for receiving a light source attachment.
The present invention is directed to light fixtures with the embodiments described herein directed to troffer-style fixtures that are particularly well-suited for use with solid state light sources, such as LEDs or LED packages.
The present invention can also be used with many different types of lighting fixtures and housings, but are particularly applicable to troffer-style fixture of different sizes such as those having a 2 foot by 2 foot troffer opening. The embodiments of the present invention can also be used in troffer-fixtures having a 1 foot by 4 foot, or 2 foot by 4 foot troffer opening, or any other suitable dimension.
The invention is described herein with reference to certain embodiments, but it is understood that the invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In particular, the present invention is described below in regards to troffer-style light fixtures, but it is understood that it is applicable to many other lighting styles, types and applications. The fixtures can have LEDs or LED packages arranged in many different arrays having different shapes and different numbers of LEDs or LED packages. Many different commercially available LEDs can be used in the lighting fixtures according to the present invention such as those commercially available from Cree, Inc., including but not limited to, XLamp® XP-E LEDs or XLamp® XP-G LEDs.
It is understood that when an element is referred to as being “on” another element, it can be directly on the other element or intervening elements may also be present. Furthermore, relative terms such as “inner”, “outer”, “upper”, “above”, “lower”, “beneath”, and “below”, and similar terms, may be used herein to describe a relationship of one element to another. It is understood that these terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures.
Although the terms first, second, etc., may be used herein to describe various elements, components, regions and/or sections, these elements, components, regions, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, or section from another. Thus, unless expressly stated otherwise, a first element, component, region, or section discussed below could be termed a second element, component, region, or section without departing from the teachings of the present invention.
As used herein, the term “source” can be used to indicate a single light emitter or more than one light emitter functioning as a single source. Thus, the term “source” should not be construed as a limitation indicating either a single-element or a multi-element configuration unless clearly stated otherwise. For example, the lighting fixtures described herein as having a solid state light source, can comprise light sources having a single-element or multi-element configuration.
The term “color” as used herein with reference to light is meant to describe light having a characteristic average wavelength; it is not meant to limit the light to a single wavelength. Thus, light of a particular color (e.g., green, red, blue, yellow, etc.) includes a range of wavelengths that are grouped around a particular average wavelength.
Embodiments of the invention are described herein with reference to view illustrations. The actual thickness, angles or orientations of the elements can be different, and variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances are expected. Thus, the elements illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region of feature of an embodiment and are not intended to limit the scope of the invention.
The housing 12 may be constructed out of many sturdy materials, with some suitable materials being aluminum and cold rolled steel, and may be sized to accommodate many different lighting designs. In many cases, the housing 12 may be sized to fit within existing light fixture spaces such that the new light fixtures can be installed with a retrofit kit.
The fixtures 10, 20 comprise a back surface 16 on the housing opposite the open end. The back surface 16 can be linear, curved, or both, and can comprise a single continuous surface or multiple discreet surfaces. The back surface 16 defines a luminous surface, which is any surface that functions as an apparent light source from the perspective of an observer in the lighted area. The back surface 16 may comprise many different materials. For many indoor lighting applications, it is desirable to present a uniform, soft light source without unpleasant glare, color striping, or hot spots. Thus, the back surface 16 may comprise a diffuse white reflector such as a microcellular polyethylene terephthalate (MCPET) material or a DuPont/WhiteOptics material, for example. Other white diffuse reflective materials can also be used. The back surface 16 may also be coated with a diffuse white reflective paint.
Diffuse reflective coatings have the inherent capability to mix light from solid state light sources having different spectra (i.e., different colors). These coatings are particularly well-suited for multi-source designs where two different spectra are mixed to produce a desired output color point. For example, LEDs emitting red light may be used in combination with LEDs emitting yellow (or blue-shifted yellow, “BSY”) light to yield a white light output. A diffuse reflective coating may eliminate the need for additional spatial color-mixing schemes that can introduce lossy elements into the system; although, in some embodiments it may be desirable to use a diffuse luminous surface in combination with other diffusive elements. In some embodiments, the luminous surface may be coated with a phosphor material that converts the wavelength of at least some of the light from the light emitting diodes to achieve a light output of the desired color point.
By using a diffuse white reflective material for the back surface 16 and by positioning the light sources to emit first toward the back surface 16, either directly or indirectly, several design goals are achieved. For example, the back surface 16 performs a color-mixing function, significantly increasing both the mixing distance and the surface area of the source. Additionally, the surface luminance is modified from bright, uncomfortable point sources to a much larger, softer diffuse reflection. A diffuse white material also provides a uniform luminous appearance in the output. Harsh surface luminance gradients (max/min ratios of 10:1 or greater) that would typically require significant effort and heavy diffusers in a traditional direct view optic can be managed with much less aggressive (and lower light loss) diffusers achieving max/min ratios of 5:1, 3:1, or even 2:1.
The back surface 16 can comprise materials other than diffuse reflectors. In other embodiments, the back surface 16 can comprise a specular reflective material or a material that is partially diffuse reflective and partially specular reflective. In some embodiments, it may be desirable to use a specular material in one area and a diffuse material in another area. Many combinations are possible.
The fixture 10 can also comprise a system or mechanism to provide electrical power to the light sources which can comprise a conventional power supply or ballast having various components and circuitry. Some of these can include an AC/DC converter and one or more DC/DC converters. Conventional power supplies can comprise large and costly components, and can also require setting of the output drive signal to provide the desired light engine light emission. The setting is typically done at the factory during light engine fabrication.
The troffer-style fixture 10 can also comprise a system or mechanism to distribute electrical power to the each light source 38. In the embodiment shown, a DC signal from an AC/DC converter can be distributed to the various light sources. The DC signal can be distributed in many different ways, such as through a wiring harness or through printed circuit boards (PCBs). The wiring harness or PCBs can run along different portions of the fixture and/or the louvers and can have a connector arrangement for connecting to the electrical power to the light sources 38.
Each light source 38 can have its own DC/DC converter that can be on-board or adjacent the light source 38, that converts signal from the DC output to the appropriate DC level to drive the LEDs on the light source 38. Each of the DC/DC converters can have additional circuitry to provide other functions, such as compensating and dimming circuitry. These are only a couple of the many functions that can be provided along with the DC/DC converter.
Having respective DC/DC converters at each light source 38 can provide certain advantages. In conventional troffers having the AC/DC and DC/DC converters in one power supply can require setting of the output of the power supply at the factory to match it to the light engine of the particular troffer. Thus, if this type of combined power supply malfunctions or fails it can result in complex repair procedures or replacement of the entire troffer or light engine. By having the DC/DC converter at each light source, the AC/DC converter does not need to be set at the factory. A failed or malfunctioning AC/DC converter can be easily replaced in the field. If an on-board DC/DC converter malfunctions or fails at the light source, the light source can be removed and replaced with a functioning lighting source. The DC/DC converter on the light source will have been set to the desired level for that particular light source, so the repair procedure does not require resetting in the field.
Furthermore, the components for a combined AC/DC and DC/DC converters that drive the entire fixture can also be large and expensive. By making the DC/DC converter on-board and remote at each light source 38, smaller and less expensive components can be used because of the reduced power needed from each converter. A DC/DC converter for the entire fixture would need to accommodate 40 watts of power, or more. By dividing that load into multiple portions, the individual light source need only see 5 watts. This allows for many of the DC/DC circuit components to be consolidated into purpose-build integrated circuits, reducing cost and size. The remote DC/DC converters can also be arranged closer to the light sources which can provide for greater driving efficiency and control.
The louver 32 may be substantially hollow as shown. A hollow core provides a high surface-to-weight ratio which encourages heat dissipation from the louver 32 into the ambient while at the same time providing a lighter structure for mounting within a fixture. In some embodiments, it may be desirable to mount various structures within the louver 32 such as wires, electronic components, or active cooling devices, for example.
In some embodiments, including those with a COB element, a multicolor source is used to produce the desired light emission, such as white light, and several colored light combinations can be used to yield white light. For example, as discussed in U.S. Pat. Nos. 7,213,940 and 7,768,192, both of which are assigned to Cree, Inc., and both of which are incorporated herein by reference, it is known in the art to combine light from a blue LED with wavelength-converted yellow light to yield white light with correlated color temperature (CCT) in the range between 5000K to 7000K (often designated as “cool white”). Both blue and yellow light can be generated with a blue emitter by surrounding the emitter with phosphors that are optically responsive to the blue light. When excited, the phosphors emit yellow light which then combines with the blue light to make white. In this scheme, because the blue light is emitted in a narrow spectral range it is called saturated light. The yellow light is emitted in a much broader spectral range and, thus, is called unsaturated light.
Another example of generating white light with a multicolor source comprises combining the light from green and red LEDs. RGB schemes may also be used to generate various colors of light. In some applications, an amber emitter is added for an RGBA combination. The previous combinations are exemplary; it is understood that many different color combinations may be used in embodiments of the present invention. Several of these possible color combinations are discussed in detail in U.S. Pat. No. 7,213,940 to van de Ven et al.
Other light sources can comprise a series of clusters having two blue-shifted-yellow LEDs (“BSY”) and a single red LED (“R”). BSY refers to a color created when blue LED light is wavelength-converted by a yellow phosphor. The resulting output is a yellow-green color that lies off the black body curve. BSY and red light, when properly mixed, combine to yield light having a “warm white” appearance. These and other color combinations are described in detail in the previously incorporated patents to van de Ven (U.S. Pat. Nos. 7,213,940 and 7,768,192). The light sources according to the present invention can use a series of clusters having two BSY LEDs and two red LEDs that can yield a warm white output when sufficiently mixed.
The light sources can be arranged to emit relatively even emission with different luminous flux, with some embodiments having light sources that combine to emit at least 100 lumens, while other embodiments can emit at least 200 lumens. In still other embodiments the lighting sources can be arranged to emit at least 500 lumens.
In several of the fixture embodiments described herein, the light sources are arranged on light strips which may be disposed on the mount surface 52.
The lighting strips 80, 82, 84 each represent possible LED combinations that result in an output spectrum that can be mixed to generate white light. Each lighting strip can include the electronics and interconnections necessary to power the LEDs. In some embodiments the lighting strip comprises a printed circuit board with the LEDs mounted and interconnected thereon. The lighting strip 80 includes clusters 81 of discrete LEDs, with each LED within the cluster 81 spaced a distance from the next LED, and each cluster 81 spaced a distance from the next cluster 81. If the LEDs within a cluster are spaced at too great distance from one another, the colors of the individual sources may become visible, causing unwanted color-striping.
The scheme shown in
The lighting strip 82 includes clusters 83 of discrete LEDs. The scheme shown in
The lighting strip 84 includes clusters 85 of discrete LEDs. The scheme shown in
The lighting schemes shown in
It is understood that embodiments presented herein are meant to be exemplary. Embodiments of the present invention can comprise any combination of compatible features shown in the various figures, and these embodiments should not be limited to those expressly illustrated and discussed.
Although the present invention has been described in detail with reference to certain preferred configurations thereof, other versions are possible. Therefore, the spirit and scope of the invention should not be limited to the versions described above.
Claims (27)
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US10429018B2 (en) * | 2017-01-31 | 2019-10-01 | Hubbell Incorporated | Recessed light fixure |
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